/*
 * Copyright (c) 2011 Imre Fazekas.
 * All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * Neither the name of the Brillien nor the names of its
 * terms and concepts may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package com.vii.brillien.core.component.server;

import com.vii.brillien.core.component.AbstractPresenceManager;
import com.vii.brillien.core.component.time.CyclicPresence;
import com.vii.brillien.core.management.BrillienServices;
import com.vii.brillien.core.management.CouchDBServices;
import com.vii.brillien.core.management.db.couchdbDocument.IndispensableFlow;
import com.vii.brillien.ignition.BrillienContext;
import com.vii.brillien.ignition.transport.BrillienCommunication;
import com.vii.brillien.kernel.BrillienException;
import com.vii.brillien.kernel.annotations.PresenceService;
import com.vii.brillien.kernel.annotations.lifecycle.Resident;
import com.vii.brillien.kernel.axiom.atomic.PresenceManager;
import com.vii.streamline.structures.collections.InnerList;

import java.util.List;

/**
 * By searching unfinished flow in the underlaying couchdb, a node is capable to reexecute a flow by this Presence type
 */
@PresenceService( logLevel = PresenceService.FINEST, periodical = true )
@Resident
public class Keeper<R> extends CyclicPresence<R> {

    @Override
    public void reset() {
        super.reset();

        waitingForInputData = true;
    }

    @Override
    protected R innerCall() throws BrillienException {
        List<IndispensableFlow> indispensableFlows = CouchDBServices.getLostFlows();
        for(IndispensableFlow indispensableFlow : indispensableFlows){
            try {
                if( indispensableFlow.getActivationMessage() != null ){
                    indispensableFlow.setStartedBy( BrillienContext.SERVER_NAME );
                    indispensableFlow.setDelegatedTo( CouchDBServices.getDelegationNode() );
                    CouchDBServices.refreshIndispensableFlow( indispensableFlow );

                    log( "Retrieving lost flow's communicaiton." );

                    BrillienCommunication msg = indispensableFlow.getActivationMessage();

                    log( "Passing communication by:", new InnerList<Object>( msg ) );

                    PresenceManager manager = BrillienServices.liaison.getPresenceManagerOf( indispensableFlow.getFlowName() );
                    ((AbstractPresenceManager)manager).getMediator().receiveCommunication( msg );
                }                
            } catch (Exception e) {
                exceptionLog( Keeper.class.getName(), "innerRun", e );
            }
        }

        return null;
    }

}

